Compound for treating steel.



but preferably consists of an oil.

UNTE

FFTQE.

HARRY MOWER LEE AND FRANK GILLANDERS BOOTH, OF NEW LONDON, CONNECTI-CUT, ASSIG-NORS, BY MESNE ASSIGNMENTS, TO STEEL TEMPERING PROCESS COM-PANY, A CORPORATION OF NEW JERSEY.

COMPOUND FOR TREATING STEEL.

No Drawing.

T 0 all whom it may concern:

Be it known that we, HARRY M. LEE and FRANK Gr. BOOTH, both citizens ofthe United States, and residents of New London, in the county of NewLondon and State of Connecticut, have invented a new and ImprovedCompound for Treating Steel, of which the following is a full, clear,and exact description.

This invention relates to a new and improved compound to be used inhardening and tempering steel, and describes the method of using thesame.

An object of this invention is to provide a compound which will besimple in nature, inexpensive to manufacture, and surprisingly eflicientin its results under varying conditions.

This and further objects, together with the character and combination ofelements, will be more fully described hereinafter and particularly setout in the claims.

In this invention, the material to be treated is heated in any suitablemanner, as by means of a gas furnace, a blacksmiths forge, or the like,to the desired temperature, which will vary according to the carboncontent of the steel, and also according to the hardness desired. Thesteel, when heated to the desired point, is then plunged, for thepurpose of suddenly cooling, into a bath formed of the compound which isan important part of this invention. This compound preferably consistsof a plurality of oxidizing agents intimately mixed in a liquid, whichmay be of any suitable character, This oil may be of any suitablecharacter, but preferably is of a type having a flashing point of notless than six-hundred degrees Fahrenheit. An oil which has been usedwith great success for this purpose and therefore preferred is known asauto amber oil The oxidizing agents which are used in this solution areof such a character that they cooperate with each other and with the oilto chemically influence the formation of the cementite, so as to producea steel of great hardness and the desired toughness. These ingredientsare preferably potassium chlorate (KGlO,) and manganese dioxid (MnO Itis to be noted that the first of these odixizing agents containspotassium Specification of Letters Patent.

Application filed May 31, 1910. Serial No. 564,160.

Patented Mar. 21, 1911.

and chlorin, and that the other contains manganese. The exact action ofthese elements in the solution is not known. It may be that by theirpresence they regulate the formation of cementite and other compounds inthe meta], either merely as catalytic agents, or by chemically breakingup into nascent elements or compounds, together with small quantities ofthe oil, and effect, by chemical reaction, the formation of compounds ofthe carbon with the iron. However, itis clear that the best results havebeen obtained with these particular compounds which are oxidizing agentscontaining chlorin, potassium and manganese. lVhile these ingredientsmay be mixed in various proportions and obtain eflicient re sultsthereby, we have found that the mo t efficient results are obtained bymixing four drains of potassium chlorate, and two drains of manganesedioxid with each gallon of oil.

It has been found that by using this solution as a hardening solution,steels can be hardened to the same degree without the necessity ofpreviously heating the steel to an excessive amount, as has been foundin the case of certain types of steels when using other hardeningsolutions. This solution may be also used in drawing the temper ofsteel, and in such a case, it is heated to the desired degree, and thesteel placed therein until the temper has been drawn the desired amount.

lVhile we have shown one embodiment of our invention, we do not wish tobe limited to the specific details thereof, but desire to be protectedin various changes, modifications and alterations which we may makewithin the scope of the appended claims.

Having thus described our invention, we claim as new and desire tosecure by Letters Patent 2-- 1. A steel-treating solution, comprising achlorate, an oxidizing agent, and a fluid.

2. A steel-treating solution, comprising a chlorate, an oxidizing agent,and an oil.

3. A steel-treating solution, comprising an oxidizing agent, manganesedioxid, and a fluid.

4;. A steel-treating solution, comprising potassium chlorate, manganesedioxid, and an oil.

5. A steel-treating solution, comprising potassium chlorate, manganesedioxid, and 1 names to this specification in the presence an 011 havinga fiashlng point as high as SlX- of two subscribing WltDGSSQS;

hundred degrees FHhI'QJIhGit.

6. A steel-treating solution, comprising an FRANK GILLANDERS' BOOTHoxidizing agent, and an oil having a fiashi ing point at least as highas six-hundred del Vitnesses: grees Fahrenheit. G. H. PHILLIPS,

In testimony whereof We have signed our XVILLIAM H. CLARKE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. C.

